Date: Tue, 09 Jul 2013 20:50:03 +1200 From: Berend de Boer <berend@pobox.com> To: Daniel Kalchev <daniel@digsys.bg> Cc: freebsd-fs@freebsd.org Subject: Re: Terrible NFS4 performance: FreeBSD 9.1 + ZFS + AWS EC2 Message-ID: <8761wkyv5w.wl%berend@pobox.com> In-Reply-To: <51DBC595.4020407@digsys.bg> References: <87y59i0yni.wl%berend@pobox.com> <580122426.2916694.1373242759482.JavaMail.root@uoguelph.ca> <87a9lwyy16.wl%berend@pobox.com> <51DBC595.4020407@digsys.bg>
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>>>>> "Daniel" == Daniel Kalchev <daniel@digsys.bg> writes:
Daniel> Could you please actually post a diagram of your setup,
Daniel> with all the components, including the "low spec Linux
Daniel> server". Do not forget the RTT (ping) between these
Daniel> hosts. If you have made any network tuning too.
To be honest, I think that's of little use. I have no impact on where
my server is placed in the AWS data centre, nor what other load (cpu
or i/o) is also taking place on these boxes.
So having approximate values (I'm posting factors of 2 or 4) is the
only useful strategy.
As you can see I'm not talking about 5% differences here, only about
200% (or 2000%!!!) differences.
Pings within an AWS data centre are similar, let's say about
0.450ms. But have a reasonable range.
Unless you know AWS I think it's no use posting hardware specs (there
are none). The Linux box is a c1.medium, the FreeBSD is an
m1.large. FreeBSD is EBS optimised (but disks are not).
Daniel> Networking protocols like NFS are heavily influenced by
Daniel> factors like RTT. An "underpowered" box that is "nearby"
Daniel> (has lover RTT) usually performs much better than a
Daniel> "powerful box" with larger RTT and other network
Daniel> bottlenecks.
I fully agree with that.
Daniel> Unfortunately, AWS is far from perfect hardware emulation
Daniel> and there might be other layers that intervene with the
Daniel> NFS protocol.
Exactly right. Given that we are talking factors of difference here I
think the hardware in this case does not matter. The problem is in the
software.
--
All the best,
Berend de Boer
------------------------------------------------------
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